This is very true. At my gym, I asked this guy out who I thought was gay or at least bisexual very privately and respectfully and he went and told all of his friends what a faggot I was. This guy everyday for a year was stuck on me like a moth to light. Always staring at me, even in the mirrors, always following me around, always sweet. He would wear work out clothes that showed off his body. If I talked to another guy he would watch intently or if another guy was around he needed to make sure I saw him. So, that's when I wanted him to know I felt too. He exploded. I blame myself but I am getting past that. Since then the homophobia with him has escalated. Pictures of him if he looks effeminate are met with 'I look like a homo', if somebody calls him gay, which this guy always seems to do, is met with a defensive douchey comeback. You can tell in his pictures that he's very stiff and masculine as to not appear gay but in some pictures, when he's relaxed, he has the head tilt and appears kind of feminine.
I saw him recently and talked to him about what I told him and he said he had no idea what I was talking about and that he was into women.
I am convinced he is gay simply because of how he acted towards me and how he reacted towards me.